Dune is a series of books by Frank Herbert, with a "Prelude" series of prequels written
by Frank Herbert's son.António Martins-Tuválkin, 14 November 2004, and Marc Pasquin,
15 January 2002

It's a space opera where a feudal "house", the House of Atreides, is
exiled to a dry, sandy planet called "Arrakis", or "Dune", formerly a (very profitable due to a
certain "spice") fief of a rival "house", the House of Harkonnen.Jorge Candeias, 15 January 2002

Dune is also a movie, and additionally there are two television mini-series, Dune
and Children of Dune.Manuel Giorgini, 14 January 2002, Mike Oettle, 21 July 2002, and Eugene Ipavec,
30 August 2008

Plus, there's also a supplement called the Dune Encyclopedia Enc.
It's a reference work compiled by Willis E. McNelly, and approved by Frank Herbert.
In it, flags (and other symbols, somewhat like badges) are mentioned.Dirk Schönberger, 15 January 2002, and João Madureira,
28 April 2004

The pennant served chiefly as a battle flag; flown on a long staff, it marked a rallying point for
troops in combat. For easy recognition, it usually bore only the principal color or colors of the
arms. … House Atreides … House
Corrino … Sardaukar … Houses did not hesitate to adopt
special battle flags for situations in which ambiguity might threaten command control."

The "Prelude" serie describe the Atreides flag as Green and black with a red hawk.
I think it was the second book of Paul II as the god emperor.Marc Pasquin, 15 January & 1 August 2002

According to The Battle of Corrin BCn:
As of 88 B.G., Vorian Atreides has changed his ways as a warrior
and having used to rely on tricks and deception,
now his tactic is full-fledged millitary strike: Impatient and vengeful,
he called himself a hawk (page 611).
"Yes, I have become a hawk.From now on the hawk will be my symbol.
It will always remind me of my duty." (page 567), I am a hawk.
That is my symbol (page 614).

This accounts for the origin of the symbol; it remains unclear how
usual was for Jihad or Army of Humanity high ranking officers to have
self-apointed personal symbols, even those which would remind them of
their duty.António Martins-Tuválkin, 27 March 2006

In Dune Dune,
the Hawk crest of the House Atreides is mentioned,
but apparently as a second Atreides symbol unrelated to the flag.António Martins-Tuválkin, 28 April 2004

The Banner of the House Atreides, described only as black and green,
is referred throughout Dune Dune. It is used
on location in the planets Arrakis and Caladan (current and previous fiefs of the House),
and appears also in Paul's recurrent visions of a potential future
Arrakeen jihad made in his name.António Martins-Tuválkin, 28 April 2004

Dune frequently mentions the "Atreides green and black banner". I can't help but to think this
banner is a simple bicolour. And, since Herbert was American, undoubtedly making it horizontal
was natural for him. So, this is what I pictured in my mind as this banner of Atreides.Jorge Candeias, 15 January 2002

Funny how images can differ between people reading the same text. I was
picturing something longer, and two-tailed. Say, 3:9 with a 4 unit split. It must be because
it is always flying over something, never from.Peter Hans van den Muijzenberg, 26 & 28 August 2002

image by Eugene Ipavec, 30 August 2008

In the movie the Atreides flag is shown clearly at least twice: over their castle on Caladan,
and during the ceremonial arrival of the ducal family on Arrakis and subsequent
military procession into the government mansion in Arrakeen. Both times it is exactly
as we show, green over black (albeit much longer, ~1:3 or maybe 4.Eugene Ipavec, 30 August 2008

In the movie, there is a flag shown about the Atreides Dynasty.Manuel Giorgini, 14 January 2002

Is the flag described in Frank Herbert's book, or was it only a set designer's creation?Ivan Sache, 14 January 2002

If I recollect correctly, the flag or House Atreides is indeed described in the book,
but it is certainly not a pale-green/green bicolour.Željko Heimer, 15 January 2002

In the second volume of the series, Dune Messiah DMh,
after Paul Atreides is made Emperor, the banner is now described as green
and white — perhaps the flag shown on the movie is this one?António Martins-Tuválkin, 28 April 2004

Frank Herbert is quite aware of the passage of time in his stories, and
details will change in the course of the books. So, it's possible that
the Atreides banner changed because of the developments on Dune.Peter Hans van den Muijzenberg, 1 March 2013

In the prologue to the television mini-series "Children
of Dune," the flag of the Atreides/Muad'dib/Fremen Jihad against the
rest of the galaxy is shown: black vertical flag with a arabesque-like
stylized hawk in flight made of white intertwining lines. The same
emblem is later visible embroidered on the backs of the cloaks given
as gifts to Paul's children by the Corrino.
image by Eugene Ipavec, 30 August 2008

The green flag of the Atreides flew openly there. (page 31) The referred location is
a partially open qanat near Sietch Tabr, during the early phases of eco-transformation in Arrakis.
Isolated, "green" and "flag" might be taken as purely metaphoric (The new symbols of Arrakis:
water and green. page 31), but the context of other flag mentions shows this sentence alegoric
instead: flags are in actual use.

When infant Leto II is taken to Jacurutu, he sees, in a pre-faint hallucination a darkness where
a green flag waved. It was the green banner of the Atreides with its day and night symbols, its
Dune staff which concealed a water tube. (page 253). Inconclusive as it is,
this is probably the best flag description of the whole Dune series.António Martins-Tuválkin, 31 December 2004

In the movie, during the ceremonial arrival of the ducal family on Arrakis
and subsequent military procession into the government mansion in Arrakeen,
the flagbearer is followed up the steps into the palace by two rows of soldiers
bearing pennants of the same design, but with a vertical black band at the hoist.Eugene Ipavec, 30 August 2008

According to the Dune Encyclopedia Enc,
the House Atreide pennant was black and red.João Madureira, 28 April 2004

In Dune Messiah DMh, black seems to be
subsidiary, green being *the* Atreides color: It's mentioned in Paul's sister
Alia's body guard detail of four guard amazons in green watchrobes, and in her own
ceremonial robes: a yellow robe trimmed in Atreides green — yellow for sunlight,
green for the death which produced life. This last sentence gives an possible "meaning",
weird it may be, for the main color of the House Atreides banner.António Martins-Tuválkin, 14 November 2004

According to the Dune Encyclopedia Enc article
"great houses, arms, pennants, and insignia" (page 275), the arms of House Atreides
are sable a falcon's head couped gules encicled by laurel branches vert.João Madureira, 28 April 2004

According to the Dune Encyclopedia Enc,
House Corrino's pennant was white with a gold stripe, but as the pennant of the House,
rather than the throne, it was never used as a battle flag.João Madureira, 28 April 2004

The Banner of House Harkonnen is orange (Dune Dune page
233); an "H" mongram is used to emblazon furniture (at least).António Martins-Tuválkin, 28 April 2004

In the mini-series version of Dune, there is a flag of House Harkonnen which combines a
cross paty with the Nazi colours of red, white and black. — I think it is quarterly and
counterchanged in black and white, with a red border.Mike Oettle, 21 July 2002

If I am not mistaken, the Harkonnen flag is also described in the book, as including red
and black.Željko Heimer, 15 January 2002

In the books, the Harkonnen banner is defaced with a gryphon.Marc Pasquin, 31 July 2002

The banner of House Harkonnen, I picture more square (compared to that of
House Atreides), and with only a shallow split. Apparently it's much less lively, in my mind;
like the house it represents.Peter Hans van den Muijzenberg, 28 August 2002

According to the Dune Encyclopedia Enc article
"great houses, arms, pennants, and insignia" (page 275), the arms of House Harkonnen
are white a ram's head caboshed guardant azure.João Madureira, 28 April 2004

In Dune Dune, the CHOAM company banner
is yellow with a black and red circle in the center. This flag is hoisted from the
imperial cruiser in Arrakis, showing the Emperor's stand in the dispute — this may be
one of the more significative SF events involving flags.António Martins-Tuválkin, 28 April 2004

After the 1st battle of Corrin, as of 108 B.G., more than four million people waved colorful
Jihad banners (The Battle of Corrin BCn page 283)
at the triumphal reception of the troops, back in Zimia (on Salusa Secundus).
(This is the only mention of such banners; all considered, I suggest that this is an editorial
mistake and that the authors meant here Martyrists' banners instead.)António Martins-Tuválkin, 27 March 2006

As of 108 B.G., Martyrist banner hanging on the wall of a cliff side suspensor restaurant on
Caladan, with pictures of the Three Martyrs: Serena Butler, her innocent child Manion,
and Grand Patriarch Ginjo (The Battle of Corrin BCn
page 11).

As of 108 B.G., when Honru is liberated, locals carried hastily created banners, thrown together
from rags, paint and whatever (page 22).

As of 108 B.G., in Niubbe, on Scourge-striken Parmentier, Martyrists staged long processions
through the reeling city, carrying banners, offering prayers (page 83). In Niubbe
Hospital, Vorian Atreides is attacked by a sick Martyrist: The wretch clutched a scrap of a
banner that depicted Sarena's baby Manion and he howled prayers, begging the Three Martyrs to save
him, to save them all (page 102).

On recaptured Honru, as of 108 B.G., long banners depicting Serena, Manion the Innocent, and
Grand Patriarch Iblis Ginjo unfurled from tall buildings (page 119); while still
chasing the remaining Robots, some of the just liberated Human slaves carried banners of
the Three Martyrs.António Martins-Tuválkin, 27 March 2006

As of 108 B.G., in Niubbe, on Scourge-striken Parmentier, Rayna Butler starts her anti-technology
crusade and is unexpectedly joined by the surviving Martyrists (The Battle of
Corrin BCn page 179). Those were waving pennants and and
holding staffs high, until finally Rayna turned to them in confusion. Climbing atop an abandoned
ground car, she called out, "Why do you waste your time and energy carrying those banners? Who are
you performing for? I don't want to see flags and colors. This is a crusade, not a pageant." She
jumped down andtore away a large fabric banner and handed a bare staff back to a man.
"There. Now use this to smash machines." (page 179). Several Martyrists
lowered their banners and tore them away from the poles, which they could now use as clubs and
crowbars (page 179).

For a long time Rayna had discounted the icons and stylized images but, as of 88 B.G.,
she'd come to understand that her followers required their comforting paraphernalia.
She finally accepted standard bearers (page 390).

As of 88 B.G., twenty years after the Cult started in Niubbe, cultists demonstrated in Zimia
lifting banners and pennants that were embroidered or stained with images of Serena Butler and
Manion the Innocent (page 390). Later the same year, in Zimia, banners of
Serena, Manion the Innocent, and Iblis Ginjo hung on every tall building.
(page 436), cultists surged along the boulevards carrying banners and placards,
chanting, brandishing weapons (page 489), waving banners of Saint Serena and
her child Manion (page 555).António Martins-Tuválkin, 27 March 2006

A simplified design is suggested later on: When addressing the Hall of Parliament in Zimia,
in 88 B.G., Rayna Butler wore a new green-and-white robe emblazoned with a bloodred profile of
Serena. (The Battle of Corrin BCn page 572).
Finally, at the departure of the Army of Humanity fleet before the Battle of Corrin, as of 88 B.G.,
sincere well-wisher and wide-eyed fanatics carried white banners emblazoned with
the bloodred silhuette of Serena Butler (page 580).António Martins-Tuválkin, 27 March 2006

There are also other tokens: The Manifesto of Rayna Butler was first presented during a
demonstration in Zimia later the same year, during which cultists carried cloth signs on
mobile frames, ornately bordered and lettered (page 569)

During the celebrations after the final battle of Corrin, in Zimia (and across League of Humanity
worlds), the Cult of Serena was out in the vast audience in force, holding banners and their
symbolic clubs (page 657).António Martins-Tuválkin, 27 March 2006